EP2504115A2 - Arbre à cames en segments - Google Patents

Arbre à cames en segments

Info

Publication number
EP2504115A2
EP2504115A2 EP10798468A EP10798468A EP2504115A2 EP 2504115 A2 EP2504115 A2 EP 2504115A2 EP 10798468 A EP10798468 A EP 10798468A EP 10798468 A EP10798468 A EP 10798468A EP 2504115 A2 EP2504115 A2 EP 2504115A2
Authority
EP
European Patent Office
Prior art keywords
sections
carrier
cam
carrier sections
camshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10798468A
Other languages
German (de)
English (en)
Inventor
Matthias Bechtold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neumayer Tekfor Holding GmbH
Original Assignee
Neumayer Tekfor Holding GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neumayer Tekfor Holding GmbH filed Critical Neumayer Tekfor Holding GmbH
Publication of EP2504115A2 publication Critical patent/EP2504115A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
    • F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
    • F16H53/04—Adjustable cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a camshaft having at least one
  • Carrier element and with at least one cam.
  • a camshaft has at least one carrier element, also referred to as tube or shaft, and at least one cam.
  • camshafts serve as part of the valvetrain, with the support member rotating about its longitudinal axis. The cams convert the
  • Outlet valves of the engine are controlled. In order to control the engine better depending on the load condition, there are so-called in the prior art.
  • Camshaft adjusters which bring different cams into operative engagement with the valves or adjust the settings, e.g. change the angles of the cams to each other.
  • the invention has for its object to propose a camshaft, which offers a possibility alternative to the prior art for adjusting the cam.
  • the carrier element or the shaft has at least two components or carrier sections that are axially parallel to one another
  • cams can be displaced relative to the valves or the valves can be brought into contact with differently configured cams.
  • the move in itself results as a rolling on the rolling body, for example, rollers or balls, which, for example, radially between the sections coaxially with each other
  • the carrier sections are arranged.
  • the rolling elements are guided in the guide grooves or tracks of the carrier sections.
  • the guide grooves are axially parallel to the longitudinal axis.
  • a plurality of guide grooves are preferably provided, which each
  • the guide grooves of the support sections are preferably associated with each other and each form pairs.
  • At least one ball cage is provided, wherein the ball cage holds the at least one rolling body.
  • the ball cage for example, ensures a sufficient distance between successively, e.g. Rollers arranged in a raceway. Furthermore, can be held by a ball cage rolling elements in different tracks in the same plane.
  • An embodiment provides that at least one of the at least two carrier sections on an inner side and / or on an outer side
  • the limit stop limits the axial displacement path of at least one rolling body within a guide groove or within a pair of guide grooves. It is thus virtually a stop, which limits the displacement of at least two support sections on the one hand and on the other possibly also prevents the rolling body or the rolling bodies from falling out of the area between two support sections.
  • Limit stops preferably run essentially radially, so that they each protrude into the tracks of the rolling bodies.
  • the rolling bodies by stops in their course stopped. That is, the guide grooves are preferably closed at two ends in the radial direction at least for the path of the rolling bodies.
  • a limit stop can also be formed by a radially inwardly or outwardly extending wall portion. In an alternative or additional embodiment, the stops are given, for example, by rings held in grooves.
  • An embodiment provides that at least one of the at least two carrier sections is designed substantially tubular.
  • Embodiment includes that at least one of the at least two support portions is at least partially hollow.
  • An embodiment includes that at least one alternative cam is provided, and that the alternative cam is arranged on the carrier element. At least the cam and the alternative cam are thus arranged on the carrier element.
  • This designation is intended to represent, for example, the cams of a valve, which respectively produce a different opening behavior of the valve and which are brought into contact with the valve by the axial displacement of the carrier sections.
  • a "set" of different camshafts is provided for each valve of the engine in which the camshaft is used, in one variant the cam and the alternative cam or the alternate cams are individual cams and, in an alternative embodiment, are sections of one one-piece
  • Cam element which has sections different cam contours.
  • a cam or alternative cam is designed such that it causes a shutdown of a cylinder.
  • An embodiment provides that the alternative cam and the cam are arranged on one of the at least two carrier sections. In this Design are thus the cam and the alternative cam on the same support section.
  • An embodiment includes that the alternative cam and the cam are each arranged on one of the at least two carrier sections. In this embodiment, thus are the cam and the
  • Alternative cams on different support sections but preferably on adjacently arranged support sections.
  • An embodiment provides that the cam and the alternative cam with respect to their geometry and / or with respect to the radial orientation on the support element are different from each other.
  • Displacement of the support sections can thus different cams move axially and push in operative contact with the valves.
  • different cams and alternative cams are provided, which each cause a different closing behavior of the cylinder.
  • the cams are brought into operative contact with the respective cylinders by the
  • Carrier sections on which the cams or alternative cam are located are shifted from each other. In this case, it is possible, for example, to move only selected carrier sections and to change the cams located thereon relative to the respective cylinders. Not all cylinders must be controlled the same by the invention, but they can be controlled individually or in groups. For example, the shutdown of cylinders or groups of
  • Camshaft according to the invention allows an adjustment of individual cam or cam groups.
  • An embodiment includes that only a single carrier element is provided, which consists of at least two carrier sections. In This configuration, the cams are thus of a single carrier element.
  • Carrier element i. only carried by a single shaft. This in the
  • FIG. 2 shows an enlarged detail of the camshaft of FIG. 1.
  • Fig. 1 shows a section through a erfindunbe camshaft. It consists of a support element 1, a so-called. Wave, which here in the
  • the carrier element 1 consists of a plurality of carrier sections 3, which are each introduced in sections.
  • the carrier sections 3 are designed and connected to one another in such a way that the carrier element 1 has a course with a substantially identical outside diameter.
  • Radial between each two concentrically arranged support sections 3 are each in a ball cage 8 rolling elements 4, via which the support sections 3 can be moved axially to each other along the longitudinal axis 10.
  • the ball cage 8 holds the rolling elements 4 in a plane and at a sufficient distance from each other.
  • two groups of three cams are provided here by way of example in each case. These cams are referred to as cam 2 and alternative cam 7. However, this is only for explanation. It is essential that each differently configured and / or differently oriented cam on
  • Carrier sections 3 to be distributed.
  • the application the
  • Carrier sections 3 by a corresponding device - for example, hydraulically or by gripping elements or electromagnetically, from the inside or from the outside - axially displaced, so that in each case different cams drive the valves.
  • the support sections 3 are thereby moved together or individually axially, wherein they each temporarily by a
  • Fixing device 9 can be axially fixed to each other.
  • Fixing devices 9 engage in the example shown here, on the one hand in a groove of the carrier portion arranged inside and on the other hand, depending on the displacement of the carrier sections to each other in one of the three grooves of the outer support portion.
  • This is, for example, a resilient element which has a suitable mechanism - e.g. mechanical, magnetic, etc. - can be operated while, for example, a ball or any body shifts.
  • the fixing devices 9 are operated in particular by a - not shown here - control unit.
  • further stops are possibly provided, against which the displacements take place.
  • For the displacement of individual carrier sections 3 are in one
  • Embodiment in each case at least two fixing devices 9 and their controls for moving functionally coupled together. It can be seen at the ends of the individual carrier sections 3 each have a recess, via which the carrier element 1 is stored, for example. 2 shows a detail of the variant of FIG. 1.
  • the carrier sections 3 are each hollow and substantially cylindrical. They have a widened region in which they overlap one another and in which the rolling bodies 4 are arranged.
  • the support section 3 in the widening with a larger diameter has a guide groove 5 which, for example as a track, extends axially along the longitudinal axis 10. The expansion is followed axially by an area with one smaller outer diameter.
  • cams 2 and alternative cams 7 are fastened in this variant on the area with a larger outer diameter, for example via interference fit, positive locking, welding, soldering or adhesive bonding or over a widening of the support element 1.
  • each outer support portion 3 acts here as a limit stop 6 for the rolling elements 4 and thus also for the displacement of the support sections 3 to each other. Only two pairs of guide grooves 5 can be seen here. Preferably, further pairs are arranged symmetrically around the carrier sections 3. In a further embodiment, the cams 2, 7 partially on the

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un arbre à cames comprenant un élément support et une came. L'invention est caractérisée en ce que l'élément support présente des segments supports qui sont placés axialement les uns derrière les autres le long d'un axe longitudinal et qui sont déplaçables les uns par rapport aux autres.
EP10798468A 2009-11-26 2010-10-22 Arbre à cames en segments Withdrawn EP2504115A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009055868A DE102009055868A1 (de) 2009-11-26 2009-11-26 Nockenwelle
PCT/DE2010/001245 WO2011063780A2 (fr) 2009-11-26 2010-10-22 Arbre à cames

Publications (1)

Publication Number Publication Date
EP2504115A2 true EP2504115A2 (fr) 2012-10-03

Family

ID=43927103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10798468A Withdrawn EP2504115A2 (fr) 2009-11-26 2010-10-22 Arbre à cames en segments

Country Status (6)

Country Link
US (1) US8607749B2 (fr)
EP (1) EP2504115A2 (fr)
CN (1) CN102740993A (fr)
BR (1) BR112012012527A2 (fr)
DE (1) DE102009055868A1 (fr)
WO (1) WO2011063780A2 (fr)

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Publication number Priority date Publication date Assignee Title
DE102009037268B3 (de) * 2009-08-10 2011-04-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Variabler Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
DE102009037270B4 (de) 2009-08-10 2011-04-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen
DE102011000510B4 (de) 2011-02-04 2019-03-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Schiebenockensystem mit Linearlager
DE102011051480B4 (de) 2011-06-30 2014-11-20 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit axial verschiebbarem Nockenpaket
WO2013171322A1 (fr) * 2012-05-18 2013-11-21 Schaeffler Technologies AG & Co. KG Unité d'arbres à cames
DE102013007741A1 (de) * 2013-05-07 2014-11-13 Thyssenkrupp Presta Teccenter Ag Nockenwelle
DE102014104994A1 (de) * 2014-04-08 2015-10-08 Thyssenkrupp Presta Teccenter Ag verstellbare Nockenwelle
DE102014014659B3 (de) 2014-10-08 2016-01-14 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Zylinderkopf einer Brennkraftmaschine mit wenigstens einer Nockenwelle
DE102017127044A1 (de) * 2017-11-16 2019-05-16 Thyssenkrupp Ag Schiebenockenelement, Nockenwelle und Verfahren zur Herstellung eines Schiebenockenelements
DE102018217635B3 (de) * 2018-10-15 2020-03-26 Audi Ag Ventiltrieb für eine Brennkraftmaschine
CN113565943B (zh) * 2021-07-27 2022-08-09 无锡职业技术学院 一种轮廓可变的数字化柔性移动凸轮机构

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Also Published As

Publication number Publication date
WO2011063780A3 (fr) 2011-09-15
US20120227689A1 (en) 2012-09-13
US8607749B2 (en) 2013-12-17
DE102009055868A1 (de) 2011-06-01
WO2011063780A2 (fr) 2011-06-03
CN102740993A (zh) 2012-10-17
BR112012012527A2 (pt) 2016-05-03

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